The Continuous Measurement System of Tritium for Total Amount of ALPS Treated Water at Fukushima Nuclear Power Plant

Abstract

The Government of Japan issued the ALPS-treated water discharges into the sea. To satisfy international standards, total amount control, and domestic regulation standards for tritium discharge into the sea, it is desired to establish a technology for total and continuous measurement of tritium. The liquid scintillator method, which is a conventional measurement method, cannot measure the total amount and continuously, so it is not possible to shut off the discharge in an emergency. In this development, the use of a solid scintillator, the GAGG scintillator, enabled total and continuous measurement. In addition, we succeeded in measuring tritium in a short period of time and succeeded in developing a continuous total amount of tritium measurement device that enables emergency response when ALPS-treated water is discharged into the sea.